名称:tee 位置:/usr/bin/tee 权限:所有用户 作用:双向重定向,会同时将数据流送与文件和屏幕;而输出到屏幕的,就是stdout,可以让下一下命令继续处理。 用法:tee [OPTION]... [FILE]... 选项: -a, --append append to the given FILEs, do not overwrite 追加
双向重定向,在写入文件last.list之后,还能输出到屏幕上。
复制代码代码如下: last |tee last.list cwjy1202 pts/0:0 Sat Jan 10 22:14 still logged in reboot system boot3.2.0-24-generic Sat Jan 10 21:45 - 23:02(01:16) cwjy1202 pts/0:0.0 Sat Jan 10 19:24 - down (00:00) reboot system boot3.2.0-24-generic Sat Jan 10 14:17 - 19:24(05:07) reboot system boot3.2.0-24-generic Fri Jan9 20:50 - 22:50(01:59) cwjy1202 pts/0:0 Thu Jan8 22:08 - 23:16(01:08) reboot system boot3.2.0-24-generic Thu Jan8 21:45 - 23:17(01:31) cwjy1202 pts/2:0 Wed Jan7 23:22 - 00:27(01:05) cwjy1202 pts/0:0 Wed Jan7 23:04 - 00:27(01:23) reboot system boot3.2.0-24-generic Wed Jan7 23:03 - 00:27(01:23) cwjy1202 pts/2:0 Tue Jan6 23:10 - 23:46(00:36) cwjy1202 pts/0:0 Tue Jan6 22:32 - 23:46(01:13) reboot system boot3.2.0-24-generic Tue Jan6 19:32 - 23:46(04:13) cwjy1202 pts/0:0 Tue Jan6 00:24 - 00:46(00:21) reboot system boot3.2.0-24-generic Mon Jan5 20:59 - 00:46(03:47) cwjy1202 pts/0:0 Sat Jan3 20:33 - 00:39(04:06) cwjy1202 pts/0:0 Sat Jan3 19:23 - 19:24(00:00) reboot system boot3.2.0-24-generic Sat Jan3 19:12 - 00:41(05:28) cwjy1202 pts/2:0 Sat Jan3 14:58 - 17:04(02:05) cwjy1202 pts/1:0 Sat Jan3 14:57 - 17:04(02:07) reboot system boot3.2.0-24-generic Sat Jan3 14:54 - 17:05(02:10)</p><p>wtmp begins Fri Jan2 17:17:32 2015</p><p> 注意:上名的tee命令并没有加选项 -a,这样默认文件将会被覆盖。 下面的例子,last的信息在写入文件last.list,同时还能被sed 命令处理
复制代码代码如下: $ last |tee-a last.list| sed -n "1p" cwjy1202 pts/0:0 Sat Jan 10 22:14 still logged in